Finding the Fourth Proportional to 8,721.59, 13,083.59 and 3,173.90

Step by Step Solution

1. Step 1: Write the proportion equation
   8,721.59 : 13,083.59 = 3,173.90 : x
2. Step 2: Convert to fraction form
   8,721.59/13,083.59 = 3,173.90/x
3. Step 3: Cross multiply
   8,721.59x = 13,083.59 × 3,173.90
4. Step 4: Simplify right side
   8,721.59x = 41,525,948.82
5. Step 5: Solve for x
   x = 41,525,948.82/8,721.59
6. Step 6: Final answer
   x = 4,761.28